servlet和路径参数如/xyz/{value}/test，如何在web.xml中映射? [英] Servlet and path parameters like /xyz/{value}/test, how to map in web.xml?

问题描述

servlet 是否支持如下网址:

Does servlet support urls as follows:

/xyz/{value}/test

其中 value 可以由文本或数字替换.

where value could be replaced by text or number.

如何在 web.xml 中映射它?

How to map that in the web.xml?

推荐答案

Servlet API 不支持在映射中间使用 URL 模式通配符 *.它只允许在映射结束时使用通配符 * 像 /prefix/* 或在映射开始时像这样 *.suffix>.

It's not supported by Servlet API to have the URL pattern wildcard * in middle of the mapping. It only allows the wildcard * in the end of the mapping like so /prefix/* or in the start of the mapping like so *.suffix.

使用标准允许的 URL 模式语法，最好的办法是将其映射到 /xyz/* 并使用 HttpServletRequest#getPathInfo().

With the standard allowed URL pattern syntax your best bet is to map it on /xyz/* and extract the path information using HttpServletRequest#getPathInfo().

所以，给定一个 /xyz/*，这里有一个基本的启动示例，如何提取路径信息、空检查和数组索引省略了边界检查:

So, given an <url-pattern>/xyz/*</url-pattern>, here's a basic kickoff example how to extract the path information, null checks and array index out of bounds checks omitted:

String pathInfo = request.getPathInfo(); // /{value}/test
String[] pathParts = pathInfo.split("/");
String part1 = pathParts[1]; // {value}
String part2 = pathParts[2]; // test
// ...

如果您希望使用 Apache HTTPD 的 mod_rewrite 进行更细粒度的控制，那么您可以查看 Tuckey 的 URL 重写过滤器 或 自制您自己的 URL 重写过滤器.

If you want more finer grained control like as possible with Apache HTTPD's mod_rewrite, then you could look at Tuckey's URL rewrite filter or homegrow your own URL rewrite filter.

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